Hearing-tube for sound-reproducing machines.



No. 888,818. PATENTED APR.7, 1908.

G. A. LEWIS. HEARING TUBE FOR SOUND REPRODUGING MACHINES.

APPLICATION FILED DEU.24|1906.

INVENTOR 1 WITNESSES: {5

' V vg I CKLUIL g k mk s W v M UNITED STATES PATENT OFFICE.

access a. LEWIS, or DETROIT, MICHIGAN.

HEARING-TUBE FOB SOUND-BEPBODUOIN G MACHINES.

No. 883,818. I

Tubes for Sound-Reproducing Devices, of

which the following is a specification, reference being had therein to the accompanying drawings. 1

This Invention relates to hearing tubes for phonographs and other sound reproducing devices and the object of the invention is to give the device a perfect support and ad'ustability on the head of the wearer wit iout producing any discomfort, all as more fully ereinafter described and shown in the accompanying drawings, in which Figure 1 Is an elevation of the device as in use, with one of the ear pieces shown in section. Fig. 2 is a section through the parts composing the ear piece and its connecting parts, the parts being shown detached from each other in the order in which they are connected. piece of slightly modified construction.

Referring to Figs. 1 and 2 of the drawings A is the mam tube connecting the device with the sound reproducing device. B are branch tubes leadin from the main tube. C are ear pieces attac led to the ends of the branch tubes. D is a bow-shaped sprin bar on which the ear pieces are mounte E are fastenings by nieans of which the branch tubes are supported on the spring bar D. F are extensions at the ends of the spring bar D, and G is a ta e connecting the free ends of the extensions Each ear piece is made of sheet metal preferably of aluminium to give it lightness and comprises a conical body portion or shell a formed with or provided at its contracted end with a hollow nipple b for attachment to the branch tube. The enlarged end bears a ringsha ed cap 0 which forms a recess (1 of suitab e dimension to encompass the human ear. The recess is closed at the inner end by a diaphragm e held in position on the inner wall of the ca by a clampin ring The diaphragm Is preferably ma e of thin rubber, gold heaters skin or other suit-able membrane secured under tension. The spring bar D is preferabl formed of a leaf spring and the extensions may be integral arts thereof, as shown in Fig. 3, or prefera 1 they are separate parts in which case the ar or the extensions are Specification of Letter! Batent. Application filed December 24, 1906. Serial No. 849,241.

Fig. 3 is a section of an ear Patented April 7, 1906.

ivotally connected to the car drum so as to e adjustable in relation to each other. In Figs. 1 and 2 the bar D and extensions F are made with overlapping ends )rovided with holes 9 to receive the nipple which is formed with a screw thread to secure the parts detachably together by means of a nut h. The tape G connects the free ends of the extensions F 'together and it is rcfcrably provided with an adjusting buc let for lengthening or shortening it.

In practice the-device being applied to the head the s ring bar D being suitably bowed hangs free y below the chin of the wearer Without touching any part of the body or clothing and lightly presses the ear pieces a ainst the head while the tape passing over t e head of the wearer holds them in position. By means of the extensions l* the tape will also exercise an inward pressure which tends more directly to press the ear pieces against the head at their upper margin thus to the head of the wearer, for the same rcason the nipple b enters the shell on the underside. The amount of inward pressure which the sprin readiy re ulated by manipulating the bar with the Iands and that exercised by the can be regulated by adjusting the tape.

ta e

Tlaving thus fully described my invention what I claim is.:

1. The combination with the car pieces and their branch tubes of a bow-shaped spring bar on which the same are mounted, extensions on the ends of the spring bar beyond its points of connection with the car pieces, and a tape connecting the spring bar at its ends.

2. The combination with the ear )ieces and their branch tubes, of a bow-shaped spring bar on which the ear pieces are mounted in position to ap ly to the head with the bar passing below t 1e chin and su porting the branch tubes, extensions on tie bar D exercises on the head can be ends of the spring bar beyond its points of connection with the ear pieces and an adjustable tape connecting the ends of the spring bar. I

3. The combination with the ear ieces and their branch tubes, of a bow-shaped spring bar on which the ear ieces and branch tubes are mounted in posltion to a pl) to the head, the spring bar passin be ow the chin, extensions on the ends 0 the sprin bar beyond its oints of connection wit the ear pieces anfpivotally connected thereto, and a tape connecting the free ends of the spring bar.'

4. The combination with the ear pieces formed with recesses adapted to encompass the ears, of a bow-shaped sprin bar on which the ear pieces are mounte in position to engage with the ears; branch tubes supported on the spring bar, extensions at the ends of the spring bar, beyond their points of connections with the ear pieces and a tape connecting the free ends of the extensions.

5. The combination with the ear pieces formed with recesses adapted to encompass the ears, of a bow-shaped sprin bar on which the ear ieces are mounte branch tubes supporte on the sprin bar, extensions on the ends of the spring ar-said extensions and s ring bar connected to the ear pieces relative y adjustable to each other and an adjustable tape connecting the free ends of the extensions together and formin r a support for the ear pieces on the head 0 the wearer.

6. An ear iece for hearing tube comprising aconica metallic shell provided at its contracted end with a hollow nipple and at its enlarged end with an annular cap having an annular inner wall forming a recess adapted to accommodate the ear and a membrane secured thereto and forming a diaphragm between the interior of the cone and the recess.

In testimony whereof I afiix my signature in presence of two witnesses.

GEO. A. LEWIS.

Witnesses:

O'r'ro F. BARTHEL, ANNA M. DORR. 

